µ-Phase behavior in a cast Ni-base superalloy

Qin, Xin; Jianting, Guo; Yuan, C. Z.; Yang, Gang; Zhou, Lanzhang; Ye, H. Q.

doi:10.1007/s10853-009-3738-7

Cited by 49 publications

(35 citation statements)

References 14 publications

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“…It is therefore possible that the coarsening of the σ plates leads to a reduction in the coherency of the σ -matrix interface and a corresponding driving force for spheroidisation of the precipitates to minimise the interfacial energy. A similar evolution of precipitate morphology with exposure time has previously been observed for µ phase precipitates [20,21]. For example, Sugui et al [21] observed the initial formation of thin coherent plate-like µ precipitates, which proceeded to coarsen inhomogeneously along their length and eventually separate into a series of blocky precipitates.…”

Section: Precipitation Behaviour Following Thermal Exposuresupporting

confidence: 73%

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Wilson

Hardy

Stone

2019

Journal of Alloys and Compounds

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Differential Scanning Calorimetry has been used for the first time to quantify sigma solvus temperatures in a series of model nickel-based alloys. These data were compared with thermodynamic predictions of the sigma solvus temperatures made using Thermocalc software to assess the fidelity of the available databases. It was found that the expected trend of increasing solvus temperature with increasing Mo content is correctly predicted, but that the solvus temperatures themselves are significantly under-predicted. Due to the important role that topologically close-packed phases play in limiting the service life of nickel-based superalloys, this has important implications for the use of sigma solvus temperature predictions in the alloy design process.

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Section: Precipitation Behaviour Following Thermal Exposuresupporting

confidence: 73%

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Wilson

Hardy

Stone

2019

Journal of Alloys and Compounds

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“…Previous studies have focused on the characterization of growth-defects in the µ-phase (Carvalho and De Hosson, 2001;Carvalho et al, 2000;Hiraga et al, 1983;Hirata et al, 2006;Qin et al, 2009;Stenberg and Andersson, 1979;Tawancy, 1996). However, the focus of the present study is the investigation of the deformation mechanisms.…”

Section: Active Slip Planesmentioning

confidence: 98%

“…In superalloys, the TCP µ-phase causes depletion of the γ-matrix in the solution strengthening refractory metal elements (Pessah et al, 1992;Simonetti and Caron, 1998;Sims et al, 1987;Yang et al, 2006). Dislocation pile-ups at intermetallic precipitates have been reported to cause microcracking or decohesion, embrittlement and eventually crack initiation (Chen et al, 1980;Cheng et al, 2011;Pessah et al, 1992;Qin et al, 2009;Simonetti and Caron, 1998;Tawancy, 1996;Zhao and Dong, 2012). Further, TCP phase precipitates at grain boundaries are thought to cause high stress concentrations (Pyczak et al, 2000;Sugui et al, 2010;Zhao and Dong, 2012) resulting from the high hardness of the µ-phase compared with the surrounding matrix but also the precipitates' shape and orientation relationship to the matrix.…”

Section: Introductionmentioning

confidence: 99%

Room temperature deformation in the Fe7Mo6 μ-Phase

Schröders

Sandlöbes

Birke

et al. 2018

International Journal of Plasticity

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The role of topologically close packed (TCP) phases in deformation of superalloys and steels is still not fully resolved. In particular, the intrinsic deformation mechanisms of these phases are largely unknown including the active slip systems in most of these complex crystal structures. Here, we present a first detailed investigation of the mechanical properties of the Fe7Mo6 µ-phase at room temperature using microcompression and nanoindentation with statistical EBSD-assisted slip trace analysis and TEM imaging. Slip occurs predominantly on the basal and prismatic planes, resulting also in decohesion on prismatic planes with high defect density. The correlation of the deformation structures and measured hardness reveals pronounced hardening where interaction of slip planes occurs and prevalent deformation at pre-existing defects.

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“…In the past few decades, the precipitation behavior of the μ phase has been extensively studied [10][11][12][13][14][15]. Many structural defects have been found in the μ phase in some superalloys or intermetallic compounds, such as stacking faults, twin bands, microtwins, and second-phase symbiosis [11][12][13][16][17][18]. However, there is little work on the detailed precipitation behavior of the P phase and R phase [3,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of the Topologically Close-Packed Phase in the DD5 Superalloy during Long-Term Aging

et al. 2020

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The precipitation behaviors of the topologically close-packed (TCP) phases in the bicrystal DD5 superalloy have been investigated. The results showed that the [001] crystallographic orientations are consistent with that of adjacent grains; however, the direction of the needle-like TCP phases is not consistent with that of the γ phase channels. The angle between needle-like TCP phases and γ phase channels is 45°, but the angle between the needle-like TCP phases of the adjacent grains is equal to the misorientation of the adjacent grains. Furthermore, during long-term aging, the needle-like TCP phases gradually decompose and transform into globular and short rod-like phases. The TCP phases precipitate preferentially in the dendrite. It is difficult to precipitate at the interdendrite/grain boundary, which is caused by the segregation of the constituent elements of the TCP phase to the dendrite.

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µ-Phase behavior in a cast Ni-base superalloy

Cited by 49 publications

References 14 publications

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Room temperature deformation in the Fe7Mo6 μ-Phase

Precipitation Behavior of the Topologically Close-Packed Phase in the DD5 Superalloy during Long-Term Aging

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